<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        *{
            margin: 0px;
            padding: 0px;
        }
        /* 让容器的宽度和高度都充满全屏 */
        html,body{
            width: 100%;
            height: 100%;
        }
        body{
            background-color: pink;
            display: flex;
            flex-direction: row;
            align-items: center;
            justify-content: center;
        }
        .heart{
            width: 100px;
            height: 100px;
            background-color: red;
            position: relative;
            transform: rotate(45deg);
            animation: heartbit 0.5s infinite alternate;
            box-shadow: 0 0 20px red;
        }
        .heart::before{
            content: "";
            width: 100px;
            height: 60px;
            background-color: red;
            position: absolute;
            left: 0px;
            top: -60px;
            border-radius: 300px 300px 0 0;
            box-shadow: 0 0 20px red;
        }
        .heart::after{
            content: "";
            width: 60px;
            height: 100px;
            background-color: red;
            position: absolute;
            left: -60px;
            top: 0px;
            border-radius: 100px 0 0 100px;
            box-shadow:0 0 20px red;
        }
        @keyframes heartbit {
            0%{
                transform: rotate(45deg) scale(0.6);
            }
            100%{
                transform: rotate(45deg) scale(1.4);
            }
        }
        p{
            transform: rotate(-45deg);
            position: absolute;
            left: -10px;
            bottom: 60px;
        }
    </style>

</head>
<body>

    <div class="heart">
        <p>明明白白我的心</p>
    </div>
    
</body>
</html>